Concrete-mixer



6; 0.. BERGLAND.

CONCRETE MIXER.

APPLICATION FILED JUNE 17 19%6.

Patented Nov. 11, 1919.

2 SHEETSSHEET I- Suva H501 G. O. BERGLAND.

CONCRETE MIXER. APPLICATION FILED JUNE 17. 19:6.

1,321,082. Patented Nov. 11, 1919.

2 SHEETSSHEET 2.

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GUNDER 0. BERGLAND, 0F DEERFIELD, WISCONSIN.

CONCRETE-MIXER.

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Specification of Letters Patent.

Patented Nov. 11, 19119).

Application filed June 17, 1916. Serial No. 104,163.

The object of my invention is to provide a form of construction in which the driving mechanism may be mounted permanently upon a stationary portion of the frame, except a portion of the driven gearing which is attached to the barrel and which preferably consists of a single gear wheel rigidly secured to the bottom head of the barrel.

A further object of my invention is to simplify and improve the construction of the tilting frame; also to provide improved mixing or stirring devices whereby the contents may be thoroughly stirred in the shortest possible time.

' In the drawings Figure 1 is a side elevation of a concrete mixer embodying my invention, with dotted lines showing the drum in tilted position.

Fig. 2 is a front elevation of the same.

Fig. 3 is a detail view of the barrel as seen from the open end.

Fig. 4 is a plan. View of the special piece employed to support the driven gear wheel journal, showing a portion of the gear wheel in section.

Like parts are identified by the same reference characters throughout the several views.

The main frame is composed of upwardly converging pairs of frame bars 1 and 2, the upper ends of each pair of bars meeting to form an apex and being connected with each other at the apex by a bolt 3. Cross braces 4 connect the bars 1 and 2 on each side of the main frame at an intermediate point and the bars 2 on opposite sides of the main frame are connected by a cross bar 5. and oblique braces 6. i a

A tilting frame provided with side bars 9 is pivotally supported by the bolts 3, the latter passing through the bars 9 near their centers. A tilting lever 11 is rigidly secured to one of the side bars 9, whereby the tilting frame may be manipulated from the position in which it is shown in full lines in Fig. 1 to the dotted line position.

.the bars 42 b The rear end bar 2 of the tilting frame supports a set of idle rollers 13 mounted upon bolts or trunnions 14: projecting from the bar 12. A barrel 16 is supported by the tilting frame. A gear Wheel 20 is secured to the bottom of the barrel by bolts 22.- The gear wheel is provided with a set of tubular spacing members 23 through which the bolts 22 pass, whereby said gear wheel is supported beyond the chime of the barrel. The front end of the tilting frame comprises a special piece 25 having end portions connected by bolts 26 with inturned portions 27 of the side bars 9. The central portion 28 of this special piece provides a journal for a trunnion 29 fixed to the gear wheel 20, the

trunnion, gear wheel 20 and barrel 16 being thus rigidly connected with each other. Near its open end, the barrel is provided with a special metal hoop 30 which rests upon the idle rollers 13, whereby the open end of the barrel is supported] The end frame bar 12 is twisted so that its central portion occupies a plane transverse to the axis of the barrel, whereby the hubs of the idle rollers 13 may have a flat bearing surface contact with the frame bar 12 and the rollers 13 supported in a proper position for peripheral contact with the hoop 30. Hoop '30 comprises a circular rim, wedges 33 being preferably employed underneath its outer.

margin. The specific form of the hoop, however, is'not essential to my invention. It is merely desirable that its outer surface con- 'motion transmitting mechanism comprising pulley 35, together with the shafts and gearmg, may, with the exception of the gear wheel 20, be supported in any suitable manner from the main frame, but I preferably employ an;auxiliary frame having side bars 42, cross bars 43 and 44c, and supporting legs 45, connected with the main frame bars 2 by the bolts 4 and with the front ends of I bolts 47. One of the bars 48 for the sha 36 may be mounted directly upon the bar 42. .Another bearing member 49 is preferably supported by bars 43 and 44:. Bearin members and 51 are mounted upon the bars 48 and 44 respectively and shaft 39 is journaled therein. The frame bars 42 are preferably parallel with the axis of the barrel, whereby a spur gear wheel 20 and spur pinion l0 may be used. The specific arrangement and structure of the driving mechanism is however not essential to. my invention, the driving gears being matter of selection. It is essential, however, that the driving connections shall be separable at some point between the driving pulley 35 and the gear wheel 20, one portion being supported by the tilting frame and the other by the main frame. I preferably mount the gear wheel 20 upon the tilting frame and the remainder of the driving mechanism upon the main frame in order that the tilting frame may be relieved of load as far as pos sible, and also in order to simplify the structure and particularly the structure of the tilting frame.

Within the barrel I employ a set of stirring bars 55, 56 and 57. Each of these bars comprises a piece of strap iron or steel elbowed at its rear end and secured to the bottom of the barrel at 58. Each of these stirring bars is supported from the barrel at an intermediate point by a bracket 59 of similar material. The several stirring bars are preferably spaced at different distances from the wall of the barrel, brackets 59 therefore being of differing lengths.

In operation, the barrel is adjusted to the position in which it is shown by full lines in Fig. 1, preparatory to the insertion of the mixture from which the concrete is to be formed. In this position, gear wheel 20 is in mesh with pinion 4-0. Power is then ap plied to rotate the barrel, the latter serving as a mixing drum in which the concrete is continuously lifted. and permitted to drop as the barrel rotates, the stirring bars cooperating in the mixing process by breaking up any tendency of the concrete to mass and also by moving through the concrete with a I stirring motion. When the materials have been sufficiently mixed, the operator will take hold of lever 11 and swing the tilting frame and barrel to the dotted line position of Fig. 1, whereupon the contents of the barrel will be dumped. When the tilting frame is actuated to the dotted line position, gear wheel 20 moves out of mesh with pinion 40 and the rotary movement of the barrel ceases regardless of whether or not the rotation of the pulley 35 continues.

I attach conslderable importance to the use of the tilting frame, the side bars of which extend obliquely to the axis of the barrel, whereby the gear wheel 20 may be supported with its axis coinciding with the axis of the barrel while the idle rollers 13 are supported underneath the open end of the barrel by the same frame. With this construction, the open end of the barrel is left entirely unobstructed for the insertion and removal of the contents.

I claim A concrete mixer comprising a main supporting frame, an open elongated frame having-side bars pivotally connected to the main frame at intermediate points for tilting movements thereon, a barrel having a closed end disposed between the side bars of said frame at one end of the latter, and having an open end projecting over the opposite end of said frame,- the side bars of said open frame extending obliquely to the axis of said barrel, rollers on said frame rotatably supporting the open end of the barrel from the under side, a gear Wheel rigidly secured to the closed end of the barrel in spaced relation thereto, with its axis in line with the axis of the barrel, said gear Wheel having a trunnion rigid therewith journaled in the adjacent end of said open frame, and means carried by the main frame to rotate said gear wheel and barrel when the open frame is in its normal osition for mixing the contents of the barrel? In testimony whereof I afiix. my signature in the presence of two witnesses.

GUNDER O. BERG-LAND.

Witnesses:

S. E. SiMoNsEN, H. LINDAS. 

